RE: XAUI signal detect - D2.0 comment 930
Dawson,
It seems like the need or benefit of carrying information on loss of
signal
at another interface across a XAUI link without using error codes
already
defined is limited to simple retimer applications. How much extra cost
for
all other XAUI implementations is this saving worth? Agreeing on that
might
be difficult. Is the receiver at the other end of the XAUI link the only
possible entry point for a simple retimer to send its loss of signal
info?
If not, we might have another alternative not impacting XAUI.
This is my interpretation of the alternatives. Please correct or
comment:
1. Add message wire(s) to XAUI.
2. Require XAUI transmitters and receivers to communicate LF via muting.
3. Require simple retimers to be less simple and generate error codes.
4. Accept reduced diagnostic capabilities when using simple retimers
5. Find a means for simple retimers to communicate LF without using XAUI
Best regards Tord.
-----Original Message-----
From: Kesling, Dawson W [mailto:dawson.w.kesling@xxxxxxxxx]
Sent: Tuesday, March 06, 2001 19:03
To: Serial PMD reflector (E-mail)
Subject: XAUI signal detect - D2.0 comment 930
The XAUI signal detect issue needs clarification. Signal detect was
added to
draft D2.1 of Clause 47 in response to the Task Force resolution of
comment
#930 against draft D2.0. Upon review, the editors believe there may have
been misunderstanding between the commenter's suggested remedy, the Task
Force's response, and/or the Editors' implementation of that response.
The
Task Force Chair has recommended that the resolution of the comment be
formally reconsidered at the March meeting to eliminate any and all
confusion.
Please come to the Plenary meeting next week prepared to discuss XAUI
signal
detect. We will need to fully discuss and formally decide on this
comment
before going to Working Group Ballot on the closing day. There have been
three proposals discussed on the reflector:
1. Add a new signal detect wire to the XAUI interface. This was the
commenter's original intent.
2. Monitor the existing XAUI signals for loss-of-signal. This was the
editors' implementation in D2.1.
3. Do not add any new functionality to XGXS/XAUI. Rely on existing
in-band
LF signaling.
Further reflector discussion is appropriate, particularly if there is an
proposal I have overlooked or misrepresented. Thank you all for you
effort
on this and all the XAUI issues.
-Dawson Kesling
Editor, Clause 47